author | aspinall |
Sun, 17 Dec 2006 22:43:50 +0100 | |
changeset 21867 | 8750fbc28d5c |
parent 21708 | 45e7491bea47 |
child 22360 | 26ead7ed4f4b |
permissions | -rw-r--r-- |
10805 | 1 |
(* Title: Pure/tactic.ML |
0 | 2 |
ID: $Id$ |
10805 | 3 |
Author: Lawrence C Paulson, Cambridge University Computer Laboratory |
0 | 4 |
Copyright 1991 University of Cambridge |
5 |
||
10805 | 6 |
Tactics. |
0 | 7 |
*) |
8 |
||
11774 | 9 |
signature BASIC_TACTIC = |
10 |
sig |
|
10805 | 11 |
val ares_tac : thm list -> int -> tactic |
12 |
val assume_tac : int -> tactic |
|
13 |
val atac : int ->tactic |
|
10817 | 14 |
val bimatch_from_nets_tac: |
1501 | 15 |
(int*(bool*thm)) Net.net * (int*(bool*thm)) Net.net -> int -> tactic |
10805 | 16 |
val bimatch_tac : (bool*thm)list -> int -> tactic |
10817 | 17 |
val biresolution_from_nets_tac: |
10805 | 18 |
('a list -> (bool * thm) list) -> |
19 |
bool -> 'a Net.net * 'a Net.net -> int -> tactic |
|
10817 | 20 |
val biresolve_from_nets_tac: |
1501 | 21 |
(int*(bool*thm)) Net.net * (int*(bool*thm)) Net.net -> int -> tactic |
10805 | 22 |
val biresolve_tac : (bool*thm)list -> int -> tactic |
23 |
val build_net : thm list -> (int*thm) Net.net |
|
1501 | 24 |
val build_netpair: (int*(bool*thm)) Net.net * (int*(bool*thm)) Net.net -> |
25 |
(bool*thm)list -> (int*(bool*thm)) Net.net * (int*(bool*thm)) Net.net |
|
10817 | 26 |
val compose_inst_tac : (string*string)list -> (bool*thm*int) -> |
3409
c0466958df5d
Tidying of signature. More robust renaming in freeze_thaw.
paulson
parents:
2814
diff
changeset
|
27 |
int -> tactic |
10817 | 28 |
val compose_tac : (bool * thm * int) -> int -> tactic |
10805 | 29 |
val cut_facts_tac : thm list -> int -> tactic |
13650
31bd2a8cdbe2
fixing the cut_tac method to work when there are no instantiations and the
paulson
parents:
13559
diff
changeset
|
30 |
val cut_rules_tac : thm list -> int -> tactic |
10817 | 31 |
val cut_inst_tac : (string*string)list -> thm -> int -> tactic |
7491 | 32 |
val datac : thm -> int -> int -> tactic |
10805 | 33 |
val defer_tac : int -> tactic |
34 |
val distinct_subgoals_tac : tactic |
|
35 |
val dmatch_tac : thm list -> int -> tactic |
|
36 |
val dresolve_tac : thm list -> int -> tactic |
|
10817 | 37 |
val dres_inst_tac : (string*string)list -> thm -> int -> tactic |
10805 | 38 |
val dtac : thm -> int ->tactic |
7491 | 39 |
val eatac : thm -> int -> int -> tactic |
10805 | 40 |
val etac : thm -> int ->tactic |
10817 | 41 |
val eq_assume_tac : int -> tactic |
10805 | 42 |
val ematch_tac : thm list -> int -> tactic |
43 |
val eresolve_tac : thm list -> int -> tactic |
|
44 |
val eres_inst_tac : (string*string)list -> thm -> int -> tactic |
|
7491 | 45 |
val fatac : thm -> int -> int -> tactic |
10817 | 46 |
val filter_prems_tac : (term -> bool) -> int -> tactic |
10805 | 47 |
val filter_thms : (term*term->bool) -> int*term*thm list -> thm list |
48 |
val filt_resolve_tac : thm list -> int -> int -> tactic |
|
49 |
val flexflex_tac : tactic |
|
10817 | 50 |
val forward_tac : thm list -> int -> tactic |
10805 | 51 |
val forw_inst_tac : (string*string)list -> thm -> int -> tactic |
52 |
val ftac : thm -> int ->tactic |
|
12320 | 53 |
val insert_tagged_brl : ('a * (bool * thm)) * |
54 |
(('a * (bool * thm)) Net.net * ('a * (bool * thm)) Net.net) -> |
|
55 |
('a * (bool * thm)) Net.net * ('a * (bool * thm)) Net.net |
|
56 |
val delete_tagged_brl : (bool * thm) * |
|
57 |
(('a * (bool * thm)) Net.net * ('a * (bool * thm)) Net.net) -> |
|
58 |
('a * (bool * thm)) Net.net * ('a * (bool * thm)) Net.net |
|
10805 | 59 |
val lessb : (bool * thm) * (bool * thm) -> bool |
60 |
val lift_inst_rule : thm * int * (string*string)list * thm -> thm |
|
61 |
val make_elim : thm -> thm |
|
62 |
val match_from_net_tac : (int*thm) Net.net -> int -> tactic |
|
63 |
val match_tac : thm list -> int -> tactic |
|
64 |
val metacut_tac : thm -> int -> tactic |
|
65 |
val net_bimatch_tac : (bool*thm) list -> int -> tactic |
|
66 |
val net_biresolve_tac : (bool*thm) list -> int -> tactic |
|
67 |
val net_match_tac : thm list -> int -> tactic |
|
68 |
val net_resolve_tac : thm list -> int -> tactic |
|
69 |
val rename_params_tac : string list -> int -> tactic |
|
70 |
val rename_tac : string -> int -> tactic |
|
71 |
val rename_last_tac : string -> string list -> int -> tactic |
|
72 |
val resolve_from_net_tac : (int*thm) Net.net -> int -> tactic |
|
73 |
val resolve_tac : thm list -> int -> tactic |
|
10817 | 74 |
val res_inst_tac : (string*string)list -> thm -> int -> tactic |
10805 | 75 |
val rotate_tac : int -> int -> tactic |
76 |
val rtac : thm -> int -> tactic |
|
77 |
val rule_by_tactic : tactic -> thm -> thm |
|
78 |
val solve_tac : thm list -> int -> tactic |
|
79 |
val subgoal_tac : string -> int -> tactic |
|
80 |
val subgoals_tac : string list -> int -> tactic |
|
81 |
val subgoals_of_brl : bool * thm -> int |
|
82 |
val term_lift_inst_rule : |
|
15797 | 83 |
thm * int * ((indexname * sort) * typ) list * ((indexname * typ) * term) list * thm |
1975
eec67972b1bf
renamed cterm_lift_inst_rule to term_lift_inst_rule and made it take
nipkow
parents:
1966
diff
changeset
|
84 |
-> thm |
10347 | 85 |
val instantiate_tac : (string * string) list -> tactic |
10805 | 86 |
val thin_tac : string -> int -> tactic |
87 |
val trace_goalno_tac : (int -> tactic) -> int -> tactic |
|
11774 | 88 |
end; |
0 | 89 |
|
11774 | 90 |
signature TACTIC = |
91 |
sig |
|
92 |
include BASIC_TACTIC |
|
11929 | 93 |
val innermost_params: int -> thm -> (string * typ) list |
11774 | 94 |
val untaglist: (int * 'a) list -> 'a list |
16809 | 95 |
val eq_kbrl: ('a * (bool * thm)) * ('a * (bool * thm)) -> bool |
11774 | 96 |
val orderlist: (int * 'a) list -> 'a list |
15442
3b75e1b22ff1
Added variants of instantiation functions that operate on pairs of type
berghofe
parents:
15021
diff
changeset
|
97 |
val compose_inst_tac' : (indexname * string) list -> (bool * thm * int) -> |
3b75e1b22ff1
Added variants of instantiation functions that operate on pairs of type
berghofe
parents:
15021
diff
changeset
|
98 |
int -> tactic |
3b75e1b22ff1
Added variants of instantiation functions that operate on pairs of type
berghofe
parents:
15021
diff
changeset
|
99 |
val lift_inst_rule' : thm * int * (indexname * string) list * thm -> thm |
15464
02cc838b64ca
Added variant of eres_inst_tac that operates on indexnames instead of strings.
berghofe
parents:
15453
diff
changeset
|
100 |
val eres_inst_tac' : (indexname * string) list -> thm -> int -> tactic |
15442
3b75e1b22ff1
Added variants of instantiation functions that operate on pairs of type
berghofe
parents:
15021
diff
changeset
|
101 |
val res_inst_tac' : (indexname * string) list -> thm -> int -> tactic |
15797 | 102 |
val instantiate_tac' : (indexname * string) list -> tactic |
20115 | 103 |
val make_elim_preserve: thm -> thm |
11774 | 104 |
end; |
0 | 105 |
|
11774 | 106 |
structure Tactic: TACTIC = |
0 | 107 |
struct |
108 |
||
1501 | 109 |
(*Discover which goal is chosen: SOMEGOAL(trace_goalno_tac tac) *) |
10817 | 110 |
fun trace_goalno_tac tac i st = |
4270 | 111 |
case Seq.pull(tac i st) of |
15531 | 112 |
NONE => Seq.empty |
12262 | 113 |
| seqcell => (tracing ("Subgoal " ^ string_of_int i ^ " selected"); |
10805 | 114 |
Seq.make(fn()=> seqcell)); |
0 | 115 |
|
116 |
(*Makes a rule by applying a tactic to an existing rule*) |
|
1501 | 117 |
fun rule_by_tactic tac rl = |
19925
3f9341831812
eliminated freeze/varify in favour of Variable.import/export/trade;
wenzelm
parents:
19743
diff
changeset
|
118 |
let |
3f9341831812
eliminated freeze/varify in favour of Variable.import/export/trade;
wenzelm
parents:
19743
diff
changeset
|
119 |
val ctxt = Variable.thm_context rl; |
20218
be3bfb0699ba
Variable.import(T): result includes fixed types/terms;
wenzelm
parents:
20115
diff
changeset
|
120 |
val ((_, [st]), ctxt') = Variable.import true [rl] ctxt; |
19925
3f9341831812
eliminated freeze/varify in favour of Variable.import/export/trade;
wenzelm
parents:
19743
diff
changeset
|
121 |
in |
3f9341831812
eliminated freeze/varify in favour of Variable.import/export/trade;
wenzelm
parents:
19743
diff
changeset
|
122 |
(case Seq.pull (tac st) of |
3f9341831812
eliminated freeze/varify in favour of Variable.import/export/trade;
wenzelm
parents:
19743
diff
changeset
|
123 |
NONE => raise THM ("rule_by_tactic", 0, [rl]) |
3f9341831812
eliminated freeze/varify in favour of Variable.import/export/trade;
wenzelm
parents:
19743
diff
changeset
|
124 |
| SOME (st', _) => zero_var_indexes (singleton (Variable.export ctxt' ctxt) st')) |
2688 | 125 |
end; |
10817 | 126 |
|
19925
3f9341831812
eliminated freeze/varify in favour of Variable.import/export/trade;
wenzelm
parents:
19743
diff
changeset
|
127 |
|
0 | 128 |
(*** Basic tactics ***) |
129 |
||
130 |
(*** The following fail if the goal number is out of range: |
|
131 |
thus (REPEAT (resolve_tac rules i)) stops once subgoal i disappears. *) |
|
132 |
||
133 |
(*Solve subgoal i by assumption*) |
|
134 |
fun assume_tac i = PRIMSEQ (assumption i); |
|
135 |
||
136 |
(*Solve subgoal i by assumption, using no unification*) |
|
137 |
fun eq_assume_tac i = PRIMITIVE (eq_assumption i); |
|
138 |
||
139 |
(** Resolution/matching tactics **) |
|
140 |
||
141 |
(*The composition rule/state: no lifting or var renaming. |
|
142 |
The arg = (bires_flg, orule, m) ; see bicompose for explanation.*) |
|
143 |
fun compose_tac arg i = PRIMSEQ (bicompose false arg i); |
|
144 |
||
145 |
(*Converts a "destruct" rule like P&Q==>P to an "elimination" rule |
|
146 |
like [| P&Q; P==>R |] ==> R *) |
|
147 |
fun make_elim rl = zero_var_indexes (rl RS revcut_rl); |
|
148 |
||
149 |
(*Attack subgoal i by resolution, using flags to indicate elimination rules*) |
|
150 |
fun biresolve_tac brules i = PRIMSEQ (biresolution false brules i); |
|
151 |
||
152 |
(*Resolution: the simple case, works for introduction rules*) |
|
153 |
fun resolve_tac rules = biresolve_tac (map (pair false) rules); |
|
154 |
||
155 |
(*Resolution with elimination rules only*) |
|
156 |
fun eresolve_tac rules = biresolve_tac (map (pair true) rules); |
|
157 |
||
158 |
(*Forward reasoning using destruction rules.*) |
|
159 |
fun forward_tac rls = resolve_tac (map make_elim rls) THEN' assume_tac; |
|
160 |
||
161 |
(*Like forward_tac, but deletes the assumption after use.*) |
|
162 |
fun dresolve_tac rls = eresolve_tac (map make_elim rls); |
|
163 |
||
164 |
(*Shorthand versions: for resolution with a single theorem*) |
|
7491 | 165 |
val atac = assume_tac; |
166 |
fun rtac rl = resolve_tac [rl]; |
|
167 |
fun dtac rl = dresolve_tac [rl]; |
|
1460 | 168 |
fun etac rl = eresolve_tac [rl]; |
7491 | 169 |
fun ftac rl = forward_tac [rl]; |
170 |
fun datac thm j = EVERY' (dtac thm::replicate j atac); |
|
171 |
fun eatac thm j = EVERY' (etac thm::replicate j atac); |
|
172 |
fun fatac thm j = EVERY' (ftac thm::replicate j atac); |
|
0 | 173 |
|
174 |
(*Use an assumption or some rules ... A popular combination!*) |
|
175 |
fun ares_tac rules = assume_tac ORELSE' resolve_tac rules; |
|
176 |
||
5263 | 177 |
fun solve_tac rules = resolve_tac rules THEN_ALL_NEW assume_tac; |
178 |
||
0 | 179 |
(*Matching tactics -- as above, but forbid updating of state*) |
180 |
fun bimatch_tac brules i = PRIMSEQ (biresolution true brules i); |
|
181 |
fun match_tac rules = bimatch_tac (map (pair false) rules); |
|
182 |
fun ematch_tac rules = bimatch_tac (map (pair true) rules); |
|
183 |
fun dmatch_tac rls = ematch_tac (map make_elim rls); |
|
184 |
||
185 |
(*Smash all flex-flex disagreement pairs in the proof state.*) |
|
186 |
val flexflex_tac = PRIMSEQ flexflex_rule; |
|
187 |
||
19056
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
188 |
(*Remove duplicate subgoals.*) |
10817 | 189 |
fun distinct_subgoals_tac state = |
19056
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
190 |
let |
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
191 |
val perm_tac = PRIMITIVE oo Thm.permute_prems; |
3409
c0466958df5d
Tidying of signature. More robust renaming in freeze_thaw.
paulson
parents:
2814
diff
changeset
|
192 |
|
19056
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
193 |
fun distinct_tac (i, k) = |
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
194 |
perm_tac 0 (i - 1) THEN |
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
195 |
perm_tac 1 (k - 1) THEN |
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
196 |
DETERM (PRIMSEQ (fn st => |
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
197 |
Thm.compose_no_flatten false (st, 0) 1 |
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
198 |
(Drule.incr_indexes st Drule.distinct_prems_rl))) THEN |
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
199 |
perm_tac 1 (1 - k) THEN |
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
200 |
perm_tac 0 (1 - i); |
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
201 |
|
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
202 |
fun distinct_subgoal_tac i st = |
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
203 |
(case Library.drop (i - 1, Thm.prems_of st) of |
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
204 |
[] => no_tac st |
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
205 |
| A :: Bs => |
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
206 |
st |> EVERY (fold (fn (B, k) => |
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
207 |
if A aconv B then cons (distinct_tac (i, k)) else I) (Bs ~~ (1 upto length Bs)) [])); |
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
208 |
|
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
209 |
val goals = Thm.prems_of state; |
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
210 |
val dups = distinct (eq_fst (op aconv)) (goals ~~ (1 upto length goals)); |
6ac9dfe98e54
sane version of distinct_subgoals_tac, based on composition with Drule.distinct_prems_rl;
wenzelm
parents:
18977
diff
changeset
|
211 |
in EVERY (rev (map (distinct_subgoal_tac o snd) dups)) state end; |
3409
c0466958df5d
Tidying of signature. More robust renaming in freeze_thaw.
paulson
parents:
2814
diff
changeset
|
212 |
|
11929 | 213 |
(*Determine print names of goal parameters (reversed)*) |
214 |
fun innermost_params i st = |
|
215 |
let val (_, _, Bi, _) = dest_state (st, i) |
|
216 |
in rename_wrt_term Bi (Logic.strip_params Bi) end; |
|
217 |
||
15453 | 218 |
(*params of subgoal i as they are printed*) |
19532 | 219 |
fun params_of_state i st = rev (innermost_params i st); |
16425
2427be27cc60
accomodate identification of type Sign.sg and theory;
wenzelm
parents:
16325
diff
changeset
|
220 |
|
15453 | 221 |
(*read instantiations with respect to subgoal i of proof state st*) |
222 |
fun read_insts_in_state (st, i, sinsts, rule) = |
|
16425
2427be27cc60
accomodate identification of type Sign.sg and theory;
wenzelm
parents:
16325
diff
changeset
|
223 |
let val thy = Thm.theory_of_thm st |
19532 | 224 |
and params = params_of_state i st |
16425
2427be27cc60
accomodate identification of type Sign.sg and theory;
wenzelm
parents:
16325
diff
changeset
|
225 |
and rts = types_sorts rule and (types,sorts) = types_sorts st |
17271 | 226 |
fun types'(a, ~1) = (case AList.lookup (op =) params a of NONE => types (a, ~1) | sm => sm) |
16425
2427be27cc60
accomodate identification of type Sign.sg and theory;
wenzelm
parents:
16325
diff
changeset
|
227 |
| types' ixn = types ixn; |
2427be27cc60
accomodate identification of type Sign.sg and theory;
wenzelm
parents:
16325
diff
changeset
|
228 |
val used = Drule.add_used rule (Drule.add_used st []); |
2427be27cc60
accomodate identification of type Sign.sg and theory;
wenzelm
parents:
16325
diff
changeset
|
229 |
in read_insts thy rts (types',sorts) used sinsts end; |
15453 | 230 |
|
0 | 231 |
(*Lift and instantiate a rule wrt the given state and subgoal number *) |
15442
3b75e1b22ff1
Added variants of instantiation functions that operate on pairs of type
berghofe
parents:
15021
diff
changeset
|
232 |
fun lift_inst_rule' (st, i, sinsts, rule) = |
15453 | 233 |
let val (Tinsts,insts) = read_insts_in_state (st, i, sinsts, rule) |
234 |
and {maxidx,...} = rep_thm st |
|
19532 | 235 |
and params = params_of_state i st |
0 | 236 |
val paramTs = map #2 params |
237 |
and inc = maxidx+1 |
|
16876 | 238 |
fun liftvar (Var ((a,j), T)) = Var((a, j+inc), paramTs---> Logic.incr_tvar inc T) |
0 | 239 |
| liftvar t = raise TERM("Variable expected", [t]); |
10817 | 240 |
fun liftterm t = list_abs_free (params, |
10805 | 241 |
Logic.incr_indexes(paramTs,inc) t) |
0 | 242 |
(*Lifts instantiation pair over params*) |
230 | 243 |
fun liftpair (cv,ct) = (cterm_fun liftvar cv, cterm_fun liftterm ct) |
16876 | 244 |
val lifttvar = pairself (ctyp_fun (Logic.incr_tvar inc)) |
8129
29e239c7b8c2
Thm.instantiate no longer normalizes, but Drule.instantiate does
paulson
parents:
7596
diff
changeset
|
245 |
in Drule.instantiate (map lifttvar Tinsts, map liftpair insts) |
18145 | 246 |
(Thm.lift_rule (Thm.cprem_of st i) rule) |
0 | 247 |
end; |
248 |
||
15442
3b75e1b22ff1
Added variants of instantiation functions that operate on pairs of type
berghofe
parents:
15021
diff
changeset
|
249 |
fun lift_inst_rule (st, i, sinsts, rule) = lift_inst_rule' |
20302
265b2342cf21
renamed Syntax.indexname to Syntax.read_indexname;
wenzelm
parents:
20232
diff
changeset
|
250 |
(st, i, map (apfst Syntax.read_indexname) sinsts, rule); |
15442
3b75e1b22ff1
Added variants of instantiation functions that operate on pairs of type
berghofe
parents:
15021
diff
changeset
|
251 |
|
3984 | 252 |
(* |
253 |
Like lift_inst_rule but takes terms, not strings, where the terms may contain |
|
254 |
Bounds referring to parameters of the subgoal. |
|
255 |
||
256 |
insts: [...,(vj,tj),...] |
|
257 |
||
258 |
The tj may contain references to parameters of subgoal i of the state st |
|
259 |
in the form of Bound k, i.e. the tj may be subterms of the subgoal. |
|
260 |
To saturate the lose bound vars, the tj are enclosed in abstractions |
|
261 |
corresponding to the parameters of subgoal i, thus turning them into |
|
262 |
functions. At the same time, the types of the vj are lifted. |
|
263 |
||
264 |
NB: the types in insts must be correctly instantiated already, |
|
265 |
i.e. Tinsts is not applied to insts. |
|
266 |
*) |
|
1975
eec67972b1bf
renamed cterm_lift_inst_rule to term_lift_inst_rule and made it take
nipkow
parents:
1966
diff
changeset
|
267 |
fun term_lift_inst_rule (st, i, Tinsts, insts, rule) = |
16425
2427be27cc60
accomodate identification of type Sign.sg and theory;
wenzelm
parents:
16325
diff
changeset
|
268 |
let val {maxidx,thy,...} = rep_thm st |
19532 | 269 |
val paramTs = map #2 (params_of_state i st) |
1966 | 270 |
and inc = maxidx+1 |
16876 | 271 |
fun liftvar ((a,j), T) = Var((a, j+inc), paramTs---> Logic.incr_tvar inc T) |
1975
eec67972b1bf
renamed cterm_lift_inst_rule to term_lift_inst_rule and made it take
nipkow
parents:
1966
diff
changeset
|
272 |
(*lift only Var, not term, which must be lifted already*) |
16425
2427be27cc60
accomodate identification of type Sign.sg and theory;
wenzelm
parents:
16325
diff
changeset
|
273 |
fun liftpair (v,t) = (cterm_of thy (liftvar v), cterm_of thy t) |
15797 | 274 |
fun liftTpair (((a, i), S), T) = |
16425
2427be27cc60
accomodate identification of type Sign.sg and theory;
wenzelm
parents:
16325
diff
changeset
|
275 |
(ctyp_of thy (TVar ((a, i + inc), S)), |
16876 | 276 |
ctyp_of thy (Logic.incr_tvar inc T)) |
8129
29e239c7b8c2
Thm.instantiate no longer normalizes, but Drule.instantiate does
paulson
parents:
7596
diff
changeset
|
277 |
in Drule.instantiate (map liftTpair Tinsts, map liftpair insts) |
18145 | 278 |
(Thm.lift_rule (Thm.cprem_of st i) rule) |
1966 | 279 |
end; |
0 | 280 |
|
281 |
(*** Resolve after lifting and instantation; may refer to parameters of the |
|
282 |
subgoal. Fails if "i" is out of range. ***) |
|
283 |
||
284 |
(*compose version: arguments are as for bicompose.*) |
|
15442
3b75e1b22ff1
Added variants of instantiation functions that operate on pairs of type
berghofe
parents:
15021
diff
changeset
|
285 |
fun gen_compose_inst_tac instf sinsts (bires_flg, rule, nsubgoal) i st = |
8977
dd8bc754a072
res_inst_tac, etc., no longer print the "dest_state" message when the selected
paulson
parents:
8129
diff
changeset
|
286 |
if i > nprems_of st then no_tac st |
dd8bc754a072
res_inst_tac, etc., no longer print the "dest_state" message when the selected
paulson
parents:
8129
diff
changeset
|
287 |
else st |> |
15442
3b75e1b22ff1
Added variants of instantiation functions that operate on pairs of type
berghofe
parents:
15021
diff
changeset
|
288 |
(compose_tac (bires_flg, instf (st, i, sinsts, rule), nsubgoal) i |
12262 | 289 |
handle TERM (msg,_) => (warning msg; no_tac) |
290 |
| THM (msg,_,_) => (warning msg; no_tac)); |
|
0 | 291 |
|
15442
3b75e1b22ff1
Added variants of instantiation functions that operate on pairs of type
berghofe
parents:
15021
diff
changeset
|
292 |
val compose_inst_tac = gen_compose_inst_tac lift_inst_rule; |
3b75e1b22ff1
Added variants of instantiation functions that operate on pairs of type
berghofe
parents:
15021
diff
changeset
|
293 |
val compose_inst_tac' = gen_compose_inst_tac lift_inst_rule'; |
3b75e1b22ff1
Added variants of instantiation functions that operate on pairs of type
berghofe
parents:
15021
diff
changeset
|
294 |
|
761 | 295 |
(*"Resolve" version. Note: res_inst_tac cannot behave sensibly if the |
296 |
terms that are substituted contain (term or type) unknowns from the |
|
297 |
goal, because it is unable to instantiate goal unknowns at the same time. |
|
298 |
||
2029 | 299 |
The type checker is instructed not to freeze flexible type vars that |
952
9e10962866b0
Removed an old bug which made some simultaneous instantiations fail if they
nipkow
parents:
949
diff
changeset
|
300 |
were introduced during type inference and still remain in the term at the |
9e10962866b0
Removed an old bug which made some simultaneous instantiations fail if they
nipkow
parents:
949
diff
changeset
|
301 |
end. This increases flexibility but can introduce schematic type vars in |
9e10962866b0
Removed an old bug which made some simultaneous instantiations fail if they
nipkow
parents:
949
diff
changeset
|
302 |
goals. |
761 | 303 |
*) |
0 | 304 |
fun res_inst_tac sinsts rule i = |
305 |
compose_inst_tac sinsts (false, rule, nprems_of rule) i; |
|
306 |
||
15442
3b75e1b22ff1
Added variants of instantiation functions that operate on pairs of type
berghofe
parents:
15021
diff
changeset
|
307 |
fun res_inst_tac' sinsts rule i = |
3b75e1b22ff1
Added variants of instantiation functions that operate on pairs of type
berghofe
parents:
15021
diff
changeset
|
308 |
compose_inst_tac' sinsts (false, rule, nprems_of rule) i; |
3b75e1b22ff1
Added variants of instantiation functions that operate on pairs of type
berghofe
parents:
15021
diff
changeset
|
309 |
|
1501 | 310 |
(*eresolve elimination version*) |
0 | 311 |
fun eres_inst_tac sinsts rule i = |
312 |
compose_inst_tac sinsts (true, rule, nprems_of rule) i; |
|
313 |
||
15464
02cc838b64ca
Added variant of eres_inst_tac that operates on indexnames instead of strings.
berghofe
parents:
15453
diff
changeset
|
314 |
fun eres_inst_tac' sinsts rule i = |
02cc838b64ca
Added variant of eres_inst_tac that operates on indexnames instead of strings.
berghofe
parents:
15453
diff
changeset
|
315 |
compose_inst_tac' sinsts (true, rule, nprems_of rule) i; |
02cc838b64ca
Added variant of eres_inst_tac that operates on indexnames instead of strings.
berghofe
parents:
15453
diff
changeset
|
316 |
|
270
d506ea00c825
tactic/make_elim_preserve: recoded to avoid using lift_inst_rule. Instead
lcp
parents:
230
diff
changeset
|
317 |
(*For forw_inst_tac and dres_inst_tac. Preserve Var indexes of rl; |
d506ea00c825
tactic/make_elim_preserve: recoded to avoid using lift_inst_rule. Instead
lcp
parents:
230
diff
changeset
|
318 |
increment revcut_rl instead.*) |
10817 | 319 |
fun make_elim_preserve rl = |
270
d506ea00c825
tactic/make_elim_preserve: recoded to avoid using lift_inst_rule. Instead
lcp
parents:
230
diff
changeset
|
320 |
let val {maxidx,...} = rep_thm rl |
16425
2427be27cc60
accomodate identification of type Sign.sg and theory;
wenzelm
parents:
16325
diff
changeset
|
321 |
fun cvar ixn = cterm_of ProtoPure.thy (Var(ixn,propT)); |
10817 | 322 |
val revcut_rl' = |
10805 | 323 |
instantiate ([], [(cvar("V",0), cvar("V",maxidx+1)), |
324 |
(cvar("W",0), cvar("W",maxidx+1))]) revcut_rl |
|
0 | 325 |
val arg = (false, rl, nprems_of rl) |
4270 | 326 |
val [th] = Seq.list_of (bicompose false arg 1 revcut_rl') |
0 | 327 |
in th end |
328 |
handle Bind => raise THM("make_elim_preserve", 1, [rl]); |
|
329 |
||
270
d506ea00c825
tactic/make_elim_preserve: recoded to avoid using lift_inst_rule. Instead
lcp
parents:
230
diff
changeset
|
330 |
(*instantiate and cut -- for a FACT, anyway...*) |
d506ea00c825
tactic/make_elim_preserve: recoded to avoid using lift_inst_rule. Instead
lcp
parents:
230
diff
changeset
|
331 |
fun cut_inst_tac sinsts rule = res_inst_tac sinsts (make_elim_preserve rule); |
0 | 332 |
|
270
d506ea00c825
tactic/make_elim_preserve: recoded to avoid using lift_inst_rule. Instead
lcp
parents:
230
diff
changeset
|
333 |
(*forward tactic applies a RULE to an assumption without deleting it*) |
d506ea00c825
tactic/make_elim_preserve: recoded to avoid using lift_inst_rule. Instead
lcp
parents:
230
diff
changeset
|
334 |
fun forw_inst_tac sinsts rule = cut_inst_tac sinsts rule THEN' assume_tac; |
d506ea00c825
tactic/make_elim_preserve: recoded to avoid using lift_inst_rule. Instead
lcp
parents:
230
diff
changeset
|
335 |
|
d506ea00c825
tactic/make_elim_preserve: recoded to avoid using lift_inst_rule. Instead
lcp
parents:
230
diff
changeset
|
336 |
(*dresolve tactic applies a RULE to replace an assumption*) |
0 | 337 |
fun dres_inst_tac sinsts rule = eres_inst_tac sinsts (make_elim_preserve rule); |
338 |
||
10347 | 339 |
(*instantiate variables in the whole state*) |
340 |
val instantiate_tac = PRIMITIVE o read_instantiate; |
|
341 |
||
15797 | 342 |
val instantiate_tac' = PRIMITIVE o Drule.read_instantiate'; |
343 |
||
1951 | 344 |
(*Deletion of an assumption*) |
345 |
fun thin_tac s = eres_inst_tac [("V",s)] thin_rl; |
|
346 |
||
270
d506ea00c825
tactic/make_elim_preserve: recoded to avoid using lift_inst_rule. Instead
lcp
parents:
230
diff
changeset
|
347 |
(*** Applications of cut_rl ***) |
0 | 348 |
|
349 |
(*Used by metacut_tac*) |
|
350 |
fun bires_cut_tac arg i = |
|
1460 | 351 |
resolve_tac [cut_rl] i THEN biresolve_tac arg (i+1) ; |
0 | 352 |
|
353 |
(*The conclusion of the rule gets assumed in subgoal i, |
|
354 |
while subgoal i+1,... are the premises of the rule.*) |
|
355 |
fun metacut_tac rule = bires_cut_tac [(false,rule)]; |
|
356 |
||
13650
31bd2a8cdbe2
fixing the cut_tac method to work when there are no instantiations and the
paulson
parents:
13559
diff
changeset
|
357 |
(*"Cut" a list of rules into the goal. Their premises will become new |
31bd2a8cdbe2
fixing the cut_tac method to work when there are no instantiations and the
paulson
parents:
13559
diff
changeset
|
358 |
subgoals.*) |
31bd2a8cdbe2
fixing the cut_tac method to work when there are no instantiations and the
paulson
parents:
13559
diff
changeset
|
359 |
fun cut_rules_tac ths i = EVERY (map (fn th => metacut_tac th i) ths); |
31bd2a8cdbe2
fixing the cut_tac method to work when there are no instantiations and the
paulson
parents:
13559
diff
changeset
|
360 |
|
31bd2a8cdbe2
fixing the cut_tac method to work when there are no instantiations and the
paulson
parents:
13559
diff
changeset
|
361 |
(*As above, but inserts only facts (unconditional theorems); |
31bd2a8cdbe2
fixing the cut_tac method to work when there are no instantiations and the
paulson
parents:
13559
diff
changeset
|
362 |
generates no additional subgoals. *) |
20232 | 363 |
fun cut_facts_tac ths = cut_rules_tac (filter Thm.no_prems ths); |
0 | 364 |
|
365 |
(*Introduce the given proposition as a lemma and subgoal*) |
|
12847
afa356dbcb15
fixed subgoal_tac; fails on non-existent subgoal;
wenzelm
parents:
12801
diff
changeset
|
366 |
fun subgoal_tac sprop = |
afa356dbcb15
fixed subgoal_tac; fails on non-existent subgoal;
wenzelm
parents:
12801
diff
changeset
|
367 |
DETERM o res_inst_tac [("psi", sprop)] cut_rl THEN' SUBGOAL (fn (prop, _) => |
afa356dbcb15
fixed subgoal_tac; fails on non-existent subgoal;
wenzelm
parents:
12801
diff
changeset
|
368 |
let val concl' = Logic.strip_assums_concl prop in |
4178
e64ff1c1bc70
subgoal_tac displays a warning if the new subgoal has type variables
paulson
parents:
3991
diff
changeset
|
369 |
if null (term_tvars concl') then () |
e64ff1c1bc70
subgoal_tac displays a warning if the new subgoal has type variables
paulson
parents:
3991
diff
changeset
|
370 |
else warning"Type variables in new subgoal: add a type constraint?"; |
12847
afa356dbcb15
fixed subgoal_tac; fails on non-existent subgoal;
wenzelm
parents:
12801
diff
changeset
|
371 |
all_tac |
afa356dbcb15
fixed subgoal_tac; fails on non-existent subgoal;
wenzelm
parents:
12801
diff
changeset
|
372 |
end); |
0 | 373 |
|
439 | 374 |
(*Introduce a list of lemmas and subgoals*) |
375 |
fun subgoals_tac sprops = EVERY' (map subgoal_tac sprops); |
|
376 |
||
0 | 377 |
|
378 |
(**** Indexing and filtering of theorems ****) |
|
379 |
||
380 |
(*Returns the list of potentially resolvable theorems for the goal "prem", |
|
10805 | 381 |
using the predicate could(subgoal,concl). |
0 | 382 |
Resulting list is no longer than "limit"*) |
383 |
fun filter_thms could (limit, prem, ths) = |
|
384 |
let val pb = Logic.strip_assums_concl prem; (*delete assumptions*) |
|
385 |
fun filtr (limit, []) = [] |
|
10805 | 386 |
| filtr (limit, th::ths) = |
387 |
if limit=0 then [] |
|
388 |
else if could(pb, concl_of th) then th :: filtr(limit-1, ths) |
|
389 |
else filtr(limit,ths) |
|
0 | 390 |
in filtr(limit,ths) end; |
391 |
||
392 |
||
393 |
(*** biresolution and resolution using nets ***) |
|
394 |
||
395 |
(** To preserve the order of the rules, tag them with increasing integers **) |
|
396 |
||
397 |
(*insert tags*) |
|
398 |
fun taglist k [] = [] |
|
399 |
| taglist k (x::xs) = (k,x) :: taglist (k+1) xs; |
|
400 |
||
401 |
(*remove tags and suppress duplicates -- list is assumed sorted!*) |
|
402 |
fun untaglist [] = [] |
|
403 |
| untaglist [(k:int,x)] = [x] |
|
404 |
| untaglist ((k,x) :: (rest as (k',x')::_)) = |
|
405 |
if k=k' then untaglist rest |
|
406 |
else x :: untaglist rest; |
|
407 |
||
408 |
(*return list elements in original order*) |
|
10817 | 409 |
fun orderlist kbrls = untaglist (sort (int_ord o pairself fst) kbrls); |
0 | 410 |
|
411 |
(*insert one tagged brl into the pair of nets*) |
|
12320 | 412 |
fun insert_tagged_brl (kbrl as (k, (eres, th)), (inet, enet)) = |
413 |
if eres then |
|
414 |
(case try Thm.major_prem_of th of |
|
16809 | 415 |
SOME prem => (inet, Net.insert_term (K false) (prem, kbrl) enet) |
15531 | 416 |
| NONE => error "insert_tagged_brl: elimination rule with no premises") |
16809 | 417 |
else (Net.insert_term (K false) (concl_of th, kbrl) inet, enet); |
0 | 418 |
|
419 |
(*build a pair of nets for biresolution*) |
|
10817 | 420 |
fun build_netpair netpair brls = |
15574
b1d1b5bfc464
Removed practically all references to Library.foldr.
skalberg
parents:
15570
diff
changeset
|
421 |
foldr insert_tagged_brl netpair (taglist 1 brls); |
0 | 422 |
|
12320 | 423 |
(*delete one kbrl from the pair of nets*) |
16809 | 424 |
fun eq_kbrl ((_, (_, th)), (_, (_, th'))) = Drule.eq_thm_prop (th, th') |
425 |
||
12320 | 426 |
fun delete_tagged_brl (brl as (eres, th), (inet, enet)) = |
13925 | 427 |
(if eres then |
12320 | 428 |
(case try Thm.major_prem_of th of |
16809 | 429 |
SOME prem => (inet, Net.delete_term eq_kbrl (prem, ((), brl)) enet) |
15531 | 430 |
| NONE => (inet, enet)) (*no major premise: ignore*) |
16809 | 431 |
else (Net.delete_term eq_kbrl (Thm.concl_of th, ((), brl)) inet, enet)) |
13925 | 432 |
handle Net.DELETE => (inet,enet); |
1801 | 433 |
|
434 |
||
10817 | 435 |
(*biresolution using a pair of nets rather than rules. |
3706
e57b5902822f
Generalized and exported biresolution_from_nets_tac to allow the declaration
paulson
parents:
3575
diff
changeset
|
436 |
function "order" must sort and possibly filter the list of brls. |
e57b5902822f
Generalized and exported biresolution_from_nets_tac to allow the declaration
paulson
parents:
3575
diff
changeset
|
437 |
boolean "match" indicates matching or unification.*) |
e57b5902822f
Generalized and exported biresolution_from_nets_tac to allow the declaration
paulson
parents:
3575
diff
changeset
|
438 |
fun biresolution_from_nets_tac order match (inet,enet) = |
0 | 439 |
SUBGOAL |
440 |
(fn (prem,i) => |
|
441 |
let val hyps = Logic.strip_assums_hyp prem |
|
10817 | 442 |
and concl = Logic.strip_assums_concl prem |
19482
9f11af8f7ef9
tuned basic list operators (flat, maps, map_filter);
wenzelm
parents:
19473
diff
changeset
|
443 |
val kbrls = Net.unify_term inet concl @ maps (Net.unify_term enet) hyps |
3706
e57b5902822f
Generalized and exported biresolution_from_nets_tac to allow the declaration
paulson
parents:
3575
diff
changeset
|
444 |
in PRIMSEQ (biresolution match (order kbrls) i) end); |
0 | 445 |
|
3706
e57b5902822f
Generalized and exported biresolution_from_nets_tac to allow the declaration
paulson
parents:
3575
diff
changeset
|
446 |
(*versions taking pre-built nets. No filtering of brls*) |
e57b5902822f
Generalized and exported biresolution_from_nets_tac to allow the declaration
paulson
parents:
3575
diff
changeset
|
447 |
val biresolve_from_nets_tac = biresolution_from_nets_tac orderlist false; |
e57b5902822f
Generalized and exported biresolution_from_nets_tac to allow the declaration
paulson
parents:
3575
diff
changeset
|
448 |
val bimatch_from_nets_tac = biresolution_from_nets_tac orderlist true; |
0 | 449 |
|
450 |
(*fast versions using nets internally*) |
|
670 | 451 |
val net_biresolve_tac = |
452 |
biresolve_from_nets_tac o build_netpair(Net.empty,Net.empty); |
|
453 |
||
454 |
val net_bimatch_tac = |
|
455 |
bimatch_from_nets_tac o build_netpair(Net.empty,Net.empty); |
|
0 | 456 |
|
457 |
(*** Simpler version for resolve_tac -- only one net, and no hyps ***) |
|
458 |
||
459 |
(*insert one tagged rl into the net*) |
|
460 |
fun insert_krl (krl as (k,th), net) = |
|
16809 | 461 |
Net.insert_term (K false) (concl_of th, krl) net; |
0 | 462 |
|
463 |
(*build a net of rules for resolution*) |
|
10817 | 464 |
fun build_net rls = |
15574
b1d1b5bfc464
Removed practically all references to Library.foldr.
skalberg
parents:
15570
diff
changeset
|
465 |
foldr insert_krl Net.empty (taglist 1 rls); |
0 | 466 |
|
467 |
(*resolution using a net rather than rules; pred supports filt_resolve_tac*) |
|
468 |
fun filt_resolution_from_net_tac match pred net = |
|
469 |
SUBGOAL |
|
470 |
(fn (prem,i) => |
|
471 |
let val krls = Net.unify_term net (Logic.strip_assums_concl prem) |
|
10817 | 472 |
in |
473 |
if pred krls |
|
0 | 474 |
then PRIMSEQ |
10805 | 475 |
(biresolution match (map (pair false) (orderlist krls)) i) |
0 | 476 |
else no_tac |
477 |
end); |
|
478 |
||
479 |
(*Resolve the subgoal using the rules (making a net) unless too flexible, |
|
480 |
which means more than maxr rules are unifiable. *) |
|
10817 | 481 |
fun filt_resolve_tac rules maxr = |
0 | 482 |
let fun pred krls = length krls <= maxr |
483 |
in filt_resolution_from_net_tac false pred (build_net rules) end; |
|
484 |
||
485 |
(*versions taking pre-built nets*) |
|
486 |
val resolve_from_net_tac = filt_resolution_from_net_tac false (K true); |
|
487 |
val match_from_net_tac = filt_resolution_from_net_tac true (K true); |
|
488 |
||
489 |
(*fast versions using nets internally*) |
|
490 |
val net_resolve_tac = resolve_from_net_tac o build_net; |
|
491 |
val net_match_tac = match_from_net_tac o build_net; |
|
492 |
||
493 |
||
494 |
(*** For Natural Deduction using (bires_flg, rule) pairs ***) |
|
495 |
||
496 |
(*The number of new subgoals produced by the brule*) |
|
1077
c2df11ae8b55
Renamed insert_kbrl to insert_tagged_brl and exported it. Now
lcp
parents:
952
diff
changeset
|
497 |
fun subgoals_of_brl (true,rule) = nprems_of rule - 1 |
c2df11ae8b55
Renamed insert_kbrl to insert_tagged_brl and exported it. Now
lcp
parents:
952
diff
changeset
|
498 |
| subgoals_of_brl (false,rule) = nprems_of rule; |
0 | 499 |
|
500 |
(*Less-than test: for sorting to minimize number of new subgoals*) |
|
501 |
fun lessb (brl1,brl2) = subgoals_of_brl brl1 < subgoals_of_brl brl2; |
|
502 |
||
503 |
||
69
e7588b53d6b0
tactic/fold_tac,fold_goals_tac: now handle critical pairs on the
lcp
parents:
0
diff
changeset
|
504 |
(*** Renaming of parameters in a subgoal |
e7588b53d6b0
tactic/fold_tac,fold_goals_tac: now handle critical pairs on the
lcp
parents:
0
diff
changeset
|
505 |
Names may contain letters, digits or primes and must be |
e7588b53d6b0
tactic/fold_tac,fold_goals_tac: now handle critical pairs on the
lcp
parents:
0
diff
changeset
|
506 |
separated by blanks ***) |
0 | 507 |
|
9535 | 508 |
fun rename_params_tac xs i = |
14673 | 509 |
case Library.find_first (not o Syntax.is_identifier) xs of |
15531 | 510 |
SOME x => error ("Not an identifier: " ^ x) |
16425
2427be27cc60
accomodate identification of type Sign.sg and theory;
wenzelm
parents:
16325
diff
changeset
|
511 |
| NONE => |
13559
51c3ac47d127
added checking so that (rename_tac "x y") is rejected, since
paulson
parents:
13105
diff
changeset
|
512 |
(if !Logic.auto_rename |
16425
2427be27cc60
accomodate identification of type Sign.sg and theory;
wenzelm
parents:
16325
diff
changeset
|
513 |
then (warning "Resetting Logic.auto_rename"; |
2427be27cc60
accomodate identification of type Sign.sg and theory;
wenzelm
parents:
16325
diff
changeset
|
514 |
Logic.auto_rename := false) |
2427be27cc60
accomodate identification of type Sign.sg and theory;
wenzelm
parents:
16325
diff
changeset
|
515 |
else (); PRIMITIVE (rename_params_rule (xs, i))); |
9535 | 516 |
|
10817 | 517 |
fun rename_tac str i = |
518 |
let val cs = Symbol.explode str in |
|
4693 | 519 |
case #2 (take_prefix (Symbol.is_letdig orf Symbol.is_blank) cs) of |
9535 | 520 |
[] => rename_params_tac (scanwords Symbol.is_letdig cs) i |
0 | 521 |
| c::_ => error ("Illegal character: " ^ c) |
522 |
end; |
|
523 |
||
1501 | 524 |
(*Rename recent parameters using names generated from a and the suffixes, |
525 |
provided the string a, which represents a term, is an identifier. *) |
|
10817 | 526 |
fun rename_last_tac a sufs i = |
0 | 527 |
let val names = map (curry op^ a) sufs |
528 |
in if Syntax.is_identifier a |
|
529 |
then PRIMITIVE (rename_params_rule (names,i)) |
|
530 |
else all_tac |
|
531 |
end; |
|
532 |
||
1501 | 533 |
(*rotate_tac n i: rotate the assumptions of subgoal i by n positions, from |
534 |
right to left if n is positive, and from left to right if n is negative.*) |
|
2672
85d7e800d754
Replaced "flat" by the Basis Library function List.concat
paulson
parents:
2580
diff
changeset
|
535 |
fun rotate_tac 0 i = all_tac |
85d7e800d754
Replaced "flat" by the Basis Library function List.concat
paulson
parents:
2580
diff
changeset
|
536 |
| rotate_tac k i = PRIMITIVE (rotate_rule k i); |
1209 | 537 |
|
7248
322151fe6f02
new primitive rule permute_prems to underlie defer_tac and rotate_prems
paulson
parents:
6979
diff
changeset
|
538 |
(*Rotates the given subgoal to be the last.*) |
322151fe6f02
new primitive rule permute_prems to underlie defer_tac and rotate_prems
paulson
parents:
6979
diff
changeset
|
539 |
fun defer_tac i = PRIMITIVE (permute_prems (i-1) 1); |
322151fe6f02
new primitive rule permute_prems to underlie defer_tac and rotate_prems
paulson
parents:
6979
diff
changeset
|
540 |
|
5974 | 541 |
(* remove premises that do not satisfy p; fails if all prems satisfy p *) |
542 |
fun filter_prems_tac p = |
|
15531 | 543 |
let fun Then NONE tac = SOME tac |
544 |
| Then (SOME tac) tac' = SOME(tac THEN' tac'); |
|
19473 | 545 |
fun thins H (tac,n) = |
5974 | 546 |
if p H then (tac,n+1) |
547 |
else (Then tac (rotate_tac n THEN' etac thin_rl),0); |
|
548 |
in SUBGOAL(fn (subg,n) => |
|
549 |
let val Hs = Logic.strip_assums_hyp subg |
|
19473 | 550 |
in case fst(fold thins Hs (NONE,0)) of |
15531 | 551 |
NONE => no_tac | SOME tac => tac n |
5974 | 552 |
end) |
553 |
end; |
|
554 |
||
0 | 555 |
end; |
1501 | 556 |
|
11774 | 557 |
structure BasicTactic: BASIC_TACTIC = Tactic; |
558 |
open BasicTactic; |